Review of Morphological Attributes with the New 3-D Approach: Role of Roughness and Acuteness of Barite and Pyrite Particles on the Floatability


Ulusoy U. , Hiçyılmaz C., Yekeler M. , Bilgen S., Akdoğan G.

XXIV International Mineral Processing Congress, Beijing, Çin, 24 - 28 Eylül 2008, cilt.1, no.1, ss.300-309

  • Cilt numarası: 1
  • Basıldığı Şehir: Beijing
  • Basıldığı Ülke: Çin
  • Sayfa Sayısı: ss.300-309

Özet

Surface roughness and acuteness are known as the two of the main

properties of the particle morphology affecting the behavior of the powders in

the process. Since the techniques used for the morphological characterization

of powders by 2-dimensional microscopic measurement from the polished

sections that have some disadvantages, the 3-dimensional analysis has often

relied on measurements of particle morphology.

A review of literature data was presented for high-grade barite and pyrite

particles ground by ball and autogenous mills to determine the morphological

properties using a new 3-D approach based on BET nitrogen gas adsorption

and Permaran methods.

Micromeritics Flowsorb II 2300 instrument which employs BET nitrogen

adsorption technique was used for the specific surface area measurements

and the roughness of the particles. Permaran (manufactured by Outokumpu

Oy) was used for the measurements of airflow resistance of powder samples

for the acuteness. Spherical glass beads were used as reference sample for

the acuteness measurements. The obtained parameters, which are surface

roughness and acuteness, were correlated with the floatability performance of

those mineral particles.

The flotation performances of those particles ground in different mills (ball and

autogenous) were also evaluated by a Hallimond tube.

The results showed that lower roughness and acuteness values caused

higher flotation recoveries for both barite and pyrite particles that were tested

independently in different type of the mills. In other words; particles with

smooth surfaces resulted in better floatability for barite and pyrite minerals

studied.